/*
 * Copyright (c) 1998, 2011, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
 *
 *
 *
 *
 *
 *
 *
 *
 *
 *
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 */
package javax.swing.text.html.parser;

import sun.awt.AppContext;

import javax.swing.text.html.HTMLEditorKit;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.io.DataInputStream;
import java.io.ObjectInputStream;
import java.io.Reader;
import java.io.Serializable;
import java.security.AccessController;
import java.security.PrivilegedAction;

/**
 * Responsible for starting up a new DocumentParser
 * each time its parse method is invoked. Stores a
 * reference to the dtd.
 *
 * @author Sunita Mani
 */

public class ParserDelegator extends HTMLEditorKit.Parser implements Serializable {

  private static final Object DTD_KEY = new Object();

  protected static void setDefaultDTD() {
    getDefaultDTD();
  }

  private static synchronized DTD getDefaultDTD() {
    AppContext appContext = AppContext.getAppContext();

    DTD dtd = (DTD) appContext.get(DTD_KEY);

    if (dtd == null) {
      DTD _dtd = null;
      // (PENDING) Hate having to hard code!
      String nm = "html32";
      try {
        _dtd = DTD.getDTD(nm);
      } catch (IOException e) {
        // (PENDING) UGLY!
        System.out.println("Throw an exception: could not get default dtd: " + nm);
      }
      dtd = createDTD(_dtd, nm);

      appContext.put(DTD_KEY, dtd);
    }

    return dtd;
  }

  protected static DTD createDTD(DTD dtd, String name) {

    InputStream in = null;
    boolean debug = true;
    try {
      String path = name + ".bdtd";
      in = getResourceAsStream(path);
      if (in != null) {
        dtd.read(new DataInputStream(new BufferedInputStream(in)));
        dtd.putDTDHash(name, dtd);
      }
    } catch (Exception e) {
      System.out.println(e);
    }
    return dtd;
  }


  public ParserDelegator() {
    setDefaultDTD();
  }

  public void parse(Reader r, HTMLEditorKit.ParserCallback cb, boolean ignoreCharSet)
      throws IOException {
    new DocumentParser(getDefaultDTD()).parse(r, cb, ignoreCharSet);
  }

  /**
   * Fetch a resource relative to the ParserDelegator classfile.
   * If this is called on 1.2 the loading will occur under the
   * protection of a doPrivileged call to allow the ParserDelegator
   * to function when used in an applet.
   *
   * @param name the name of the resource, relative to the ParserDelegator class.
   * @returns a stream representing the resource
   */
  static InputStream getResourceAsStream(final String name) {
    return AccessController.doPrivileged(
        new PrivilegedAction<InputStream>() {
          public InputStream run() {
            return ParserDelegator.class.getResourceAsStream(name);
          }
        });
  }

  private void readObject(ObjectInputStream s)
      throws ClassNotFoundException, IOException {
    s.defaultReadObject();
    setDefaultDTD();
  }
}
